2015090 - Hitting the Left / Right arrows in the AI Chat input field will scroll the Sidebar horizontally instead of moving the cursors between characters

Status: VERIFIED FIXED

(Core :: Machine Learning: Frontend, defect, P1)

Description

[Rares Doghi, Desktop QA]

Attachment: 2026-02-06_18h48_24.mp4

Found in

• Nightly 149.0a1 (2026-02-06)

Affected versions

• Nightly 149.0a1 (2026-02-06)

Affected platforms

• All

Steps to reproduce

1. Open the AI Chat Sidebar in a Smart Window.
2. Add a Lot of text in the Chat Input field.
3. Use the Left / Right arrows to navigate between characters.

Expected result

• The keyboard cursor should move between characters.

Actual result

• The AI Chat sidebar scrolls horizontally instead of moving the keyboard cursor.

Regression range
N/A

Comment 1

[Eitan Isaacson [:eeejay]]

Access s2 because of restricted keyboard operability.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The severity field for this bug is set to S3. However, the accessibility severity is higher, .
:Mardak, could you consider increasing the severity?

For more information, please visit BugBot documentation.

Comment 3

[:Gijs (he/him)]

I did a little bit of diagnosis of the scrollbar in bug 2018921 (didn't realize this was on file) - I'm not sure if fixing that (so there isn't a scrollbar) will fix this bug and/or if there should be more work here, but it seemed worth highlighting.

Comment 4

[Giulia Cardieri (:gcardieri)]

I don't see the horizontal scrollbar, I remember fixing a similar issue for the scroll bar with https://phabricator.services.mozilla.com/D283382 / https://bugzilla.mozilla.org/show_bug.cgi?id=2015807.
However, the arrow keys are still not moving between characters so I'll work on that.

Comment 5

[:Gijs (he/him)]

(In reply to Giulia Cardieri (:gcardieri) from comment #4)

I don't see the horizontal scrollbar, I remember fixing a similar issue for the scroll bar with https://phabricator.services.mozilla.com/D283382 / https://bugzilla.mozilla.org/show_bug.cgi?id=2015807.
However, the arrow keys are still not moving between characters so I'll work on that.

bug 2018921 was fixed by Elissa yesterday and probably addressed the scrollbar portion. :-)

Comment 6

[Giulia Cardieri (:gcardieri)]

Attachment: Bug 2015090 - Add arrow keyboard support for multiline editor

Comment 7

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/404f57c22b76
https://hg.mozilla.org/integration/autoland/rev/687a3019695f
Add arrow keyboard support for multiline editor r=flozia,ai-frontend-reviewers

Comment 8

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/cbd77f640100
https://hg.mozilla.org/integration/autoland/rev/7f43dd4425c1
Revert "Bug 2015090 - Add arrow keyboard support for multiline editor r=flozia,ai-frontend-reviewers" for causing bc failures @ browser_aiwindow_smartbar_keyboard_navigation.js

Comment 9

[Sandor Molnar[:smolnar]]

Backed out for causing bc failures @ browser_aiwindow_smartbar_keyboard_navigation.js

Backout link: https://hg.mozilla.org/integration/autoland/rev/7f43dd4425c1c65a302cbd80fc291ba341ce0b66

Push with failures

Failure log -> TEST-UNEXPECTED-FAIL | browser/components/aiwindow/ui/test/browser/browser_aiwindow_smartbar_keyboard_navigation.js

Comment 10

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/872645ff732d
https://hg.mozilla.org/integration/autoland/rev/6b883047ba33
Add arrow keyboard support for multiline editor r=flozia,ai-frontend-reviewers

Comment 11

[Cosmin Sabou [:CosminS]]

https://hg.mozilla.org/mozilla-central/rev/6b883047ba33

Comment 12

[Rares Doghi, Desktop QA]

Verified as fixed in our latest Nightly 150.0a1 (2026-03-12).